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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2016, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/)

 * @license	http://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 3.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * PDO MySQL Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the query builder

 * class is being used or not.

 *

 * @package		CodeIgniter

 * @subpackage	Drivers

 * @category	Database

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_pdo_mysql_driver extends CI_DB_pdo_driver {

	/**

	 * Sub-driver

	 *

	 * @var	string

	 */

	public $subdriver = 'mysql';

	/**

	 * Compression flag

	 *

	 * @var	bool

	 */

	public $compress = FALSE;

	/**

	 * Strict ON flag

	 *

	 * Whether we're running in strict SQL mode.

	 *

	 * @var	bool

	 */

	public $stricton;

	// --------------------------------------------------------------------

	/**

	 * Identifier escape character

	 *

	 * @var	string

	 */

	protected $_escape_char = '`';

	// --------------------------------------------------------------------

	/**

	 * Class constructor

	 *

	 * Builds the DSN if not already set.

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if (empty($this->dsn))

		{

			$this->dsn = 'mysql:host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname);

			empty($this->port) OR $this->dsn .= ';port='.$this->port;

			empty($this->database) OR $this->dsn .= ';dbname='.$this->database;

			empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set;

		}

		elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE && is_php('5.3.6'))

		{

			$this->dsn .= ';charset='.$this->char_set;

		}

	}

	// --------------------------------------------------------------------

	/**

	 * Database connection

	 *

	 * @param	bool	$persistent

	 * @return	object

	 */

	public function db_connect($persistent = FALSE)

	{

		/* Prior to PHP 5.3.6, even if the charset was supplied in the DSN

		 * on connect - it was ignored. This is a work-around for the issue.

		 *

		 * Reference: http://www.php.net/manual/en/ref.pdo-mysql.connection.php

		 */

		if ( ! is_php('5.3.6') && ! empty($this->char_set))

		{

			$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET NAMES '.$this->char_set

				.(empty($this->dbcollat) ? '' : ' COLLATE '.$this->dbcollat);

		}

		if (isset($this->stricton))

		{

			if ($this->stricton)

			{

				$sql = 'CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")';

			}

			else

			{

				$sql = 'REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(

                                        @@sql_mode,

                                        "STRICT_ALL_TABLES,", ""),

                                        ",STRICT_ALL_TABLES", ""),

                                        "STRICT_ALL_TABLES", ""),

                                        "STRICT_TRANS_TABLES,", ""),

                                        ",STRICT_TRANS_TABLES", ""),

                                        "STRICT_TRANS_TABLES", "")';

			}

			if ( ! empty($sql))

			{

				if (empty($this->options[PDO::MYSQL_ATTR_INIT_COMMAND]))

				{

					$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET SESSION sql_mode = '.$sql;

				}

				else

				{

					$this->options[PDO::MYSQL_ATTR_INIT_COMMAND] .= ', @@session.sql_mode = '.$sql;

				}

			}

		}

		if ($this->compress === TRUE)

		{

			$this->options[PDO::MYSQL_ATTR_COMPRESS] = TRUE;

		}

		// SSL support was added to PDO_MYSQL in PHP 5.3.7

		if (is_array($this->encrypt) && is_php('5.3.7'))

		{

			$ssl = array();

			empty($this->encrypt['ssl_key'])    OR $ssl[PDO::MYSQL_ATTR_SSL_KEY]    = $this->encrypt['ssl_key'];

			empty($this->encrypt['ssl_cert'])   OR $ssl[PDO::MYSQL_ATTR_SSL_CERT]   = $this->encrypt['ssl_cert'];

			empty($this->encrypt['ssl_ca'])     OR $ssl[PDO::MYSQL_ATTR_SSL_CA]     = $this->encrypt['ssl_ca'];

			empty($this->encrypt['ssl_capath']) OR $ssl[PDO::MYSQL_ATTR_SSL_CAPATH] = $this->encrypt['ssl_capath'];

			empty($this->encrypt['ssl_cipher']) OR $ssl[PDO::MYSQL_ATTR_SSL_CIPHER] = $this->encrypt['ssl_cipher'];

			// DO NOT use array_merge() here!

			// It re-indexes numeric keys and the PDO_MYSQL_ATTR_SSL_* constants are integers.

			empty($ssl) OR $this->options += $ssl;

		}

		// Prior to version 5.7.3, MySQL silently downgrades to an unencrypted connection if SSL setup fails

		if (

			($pdo = parent::db_connect($persistent)) !== FALSE

			&& ! empty($ssl)

			&& version_compare($pdo->getAttribute(PDO::ATTR_CLIENT_VERSION), '5.7.3', '<=')

			&& empty($pdo->query("SHOW STATUS LIKE 'ssl_cipher'")->fetchObject()->Value)

		)

		{

			$message = 'PDO_MYSQL was configured for an SSL connection, but got an unencrypted connection instead!';

			log_message('error', $message);

			return ($this->db->db_debug) ? $this->db->display_error($message, '', TRUE) : FALSE;

		}

		return $pdo;

	}

	// --------------------------------------------------------------------

	/**

	 * Select the database

	 *

	 * @param	string	$database

	 * @return	bool

	 */

	public function db_select($database = '')

	{

		if ($database === '')

		{

			$database = $this->database;

		}

		if (FALSE !== $this->simple_query('USE '.$this->escape_identifiers($database)))

		{

			$this->database = $database;

			$this->data_cache = array();

			return TRUE;

		}

		return FALSE;

	}

	// --------------------------------------------------------------------

	/**

	 * Show table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @param	bool	$prefix_limit

	 * @return	string

	 */

	protected function _list_tables($prefix_limit = FALSE)

	{

		$sql = 'SHOW TABLES';

		if ($prefix_limit === TRUE && $this->dbprefix !== '')

		{

			return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'";

		}

		return $sql;

	}

	// --------------------------------------------------------------------

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _list_columns($table = '')

	{

		return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE);

	}

	// --------------------------------------------------------------------

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		if (($query = $this->query('SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE))) === FALSE)

		{

			return FALSE;

		}

		$query = $query->result_object();

		$retval = array();

		for ($i = 0, $c = count($query); $i < $c; $i++)

		{

			$retval[$i]			= new stdClass();

			$retval[$i]->name		= $query[$i]->Field;

			sscanf($query[$i]->Type, '%[a-z](%d)',

				$retval[$i]->type,

				$retval[$i]->max_length

			);

			$retval[$i]->default		= $query[$i]->Default;

			$retval[$i]->primary_key	= (int) ($query[$i]->Key === 'PRI');

		}

		return $retval;

	}

	// --------------------------------------------------------------------

	/**

	 * Truncate statement

	 *

	 * Generates a platform-specific truncate string from the supplied data

	 *

	 * If the database does not support the TRUNCATE statement,

	 * then this method maps to 'DELETE FROM table'

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _truncate($table)

	{

		return 'TRUNCATE '.$table;

	}

	// --------------------------------------------------------------------

	/**

	 * FROM tables

	 *

	 * Groups tables in FROM clauses if needed, so there is no confusion

	 * about operator precedence.

	 *

	 * @return	string

	 */

	protected function _from_tables()

	{

		if ( ! empty($this->qb_join) && count($this->qb_from) > 1)

		{

			return '('.implode(', ', $this->qb_from).')';

		}

		return implode(', ', $this->qb_from);

	}

}